CN113720088A - Refrigerating and freezing device and control method thereof - Google Patents
Refrigerating and freezing device and control method thereof Download PDFInfo
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- CN113720088A CN113720088A CN202111011914.4A CN202111011914A CN113720088A CN 113720088 A CN113720088 A CN 113720088A CN 202111011914 A CN202111011914 A CN 202111011914A CN 113720088 A CN113720088 A CN 113720088A
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- 238000000034 method Methods 0.000 title claims abstract description 60
- 238000007710 freezing Methods 0.000 title claims abstract description 36
- 230000008014 freezing Effects 0.000 title claims abstract description 36
- 238000010438 heat treatment Methods 0.000 claims abstract description 170
- 239000003507 refrigerant Substances 0.000 claims abstract description 67
- 238000005057 refrigeration Methods 0.000 claims abstract description 43
- 230000008859 change Effects 0.000 claims abstract description 23
- 238000003860 storage Methods 0.000 claims description 15
- 230000003213 activating effect Effects 0.000 claims description 14
- 230000007613 environmental effect Effects 0.000 claims description 13
- 230000015654 memory Effects 0.000 claims description 10
- 238000010257 thawing Methods 0.000 abstract description 71
- 230000008569 process Effects 0.000 description 17
- 230000000694 effects Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 238000012546 transfer Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 230000004913 activation Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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- 239000002699 waste material Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/002—Defroster control
- F25D21/004—Control mechanisms
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
- F25D11/02—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/06—Removing frost
- F25D21/08—Removing frost by electric heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/005—Mounting of control devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2600/00—Control issues
- F25D2600/06—Controlling according to a predetermined profile
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Defrosting Systems (AREA)
Abstract
The invention provides a refrigeration and freezing device and a control method thereof, the refrigeration and freezing device is provided with a compressor, an evaporator, a heating device and a conveying pipeline, wherein the conveying pipeline is used for conveying a refrigerant flowing out of the compressor to the evaporator so as to heat the evaporator when the evaporator defrosts, the heating device is thermally connected with the conveying pipeline, and the control method comprises the following steps: determining evaporator starting defrosting; the heating device is started to preheat the refrigerant conveyed to the evaporator through the conveying pipeline. By using the method, the refrigerating and freezing device can preheat the refrigerant conveyed to the evaporator through the conveying pipeline by using the heating device, so that excessive heat loss of the refrigerant when the refrigerant flows through the conveying pipeline can be reduced or avoided, and the evaporator can be defrosted quickly and thoroughly. Through utilizing heating device to optimize the defrosting mode of evaporimeter, can solve to a certain extent and change the cycle length, change the incomplete problem of frost, possess application prospect.
Description
Technical Field
The invention relates to refrigeration technology, in particular to a refrigeration and freezing device and a control method thereof.
Background
Refrigerating and freezing devices, such as refrigerators, freezers, storage cabinets, and the like, utilize evaporators to provide cooling energy to storage spaces. When the evaporator provides cold energy to the storage space, the surface temperature of the evaporator is low, and water vapor around the evaporator is condensed on the surface of the evaporator, so that frost is generated, the heat exchange efficiency of the evaporator is reduced, and the refrigerating effect of the refrigerating and freezing device is further influenced.
The inventor realizes how to improve the defrosting mode of the evaporator so as to quickly and completely defrost the evaporator, which is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
It is an object of the present invention to overcome at least one of the technical drawbacks of the prior art and to provide a refrigerating and freezing apparatus and a control method thereof.
A further object of the present invention is to improve the defrosting mode of the evaporator so that the evaporator can be defrosted quickly and thoroughly.
The invention further aims to adjust the defrosting strategy of the evaporator according to the actual working condition, optimize the defrosting mode of the evaporator and simultaneously realize energy conservation.
Still another further object of the present invention is to adjust and control the defrosting process to improve the fineness of the control process, thereby ensuring the defrosting effect of the evaporator.
According to an aspect of the present invention, there is provided a control method of a refrigerating and freezing apparatus having a compressor, an evaporator, a heating device, and a transfer line for transferring a refrigerant flowing out of the compressor to the evaporator to heat the evaporator when the evaporator is defrosted, and the heating device is thermally connected to the transfer line, and the control method includes: determining evaporator starting defrosting; the heating device is started to preheat the refrigerant conveyed to the evaporator through the conveying pipeline.
Optionally, after the heating device is started, the method further comprises: detecting the temperature of the conveying pipeline; judging whether the closing condition of the heating device is met or not according to the temperature of the conveying pipeline; if yes, the heating device is closed.
Optionally, the step of determining whether the shutdown condition of the heating device is satisfied according to the temperature of the delivery pipe includes: judging whether the temperature of the conveying pipeline reaches a preset pipeline temperature threshold value or not; and if so, determining that the temperature of the conveying pipeline meets the closing condition of the heating device.
Optionally, before the heating device is started, the method further comprises: detecting the environmental temperature of the working environment of the conveying pipeline; judging whether the starting condition of the heating device is met or not according to the ambient temperature; if yes, executing the step of starting the heating device.
Optionally, the step of determining whether the start condition of the heating device is satisfied according to the ambient temperature includes: judging whether the ambient temperature is lower than a preset ambient temperature threshold value or not; and if so, determining that the environmental temperature meets the starting condition of the heating device.
Optionally, the refrigeration and freezing device further comprises a switching valve and a condenser, the switching valve is connected to the exhaust port of the compressor and is provided with a valve port communicated with the conveying pipeline and a valve port communicated with the condenser; and after determining that the evaporator is activated to defrost and before activating the heating device, the control method further comprises: and controlling the switching valve to open a valve port communicated with the conveying pipeline and close a valve port communicated with the condenser, and starting the compressor so as to convey the refrigerant flowing out of the compressor to the evaporator by utilizing the conveying pipeline.
Optionally, the step of activating the heating means comprises: detecting the environmental temperature of the working environment of the heating device; determining operating parameters of the heating device according to the ambient temperature; and controlling the heating device to start according to the operation parameters.
Optionally, the operating parameter of the heating device comprises a heating power; and the step of determining the heating power of the heating device according to the ambient temperature comprises: acquiring a plurality of preset temperature ranges, wherein each temperature range is correspondingly provided with preset heating power; and determining the heating power of the heating device according to the temperature range to which the ambient temperature belongs.
Optionally, after the heating device is started, the method further comprises: continuously detecting the temperature of the evaporator within a set time period; determining the temperature change rate of the evaporator according to the temperature of the evaporator; adjusting an operating parameter of the heating device according to the rate of change of the temperature of the evaporator.
According to another aspect of the present invention, there is also provided a refrigeration and freezing apparatus comprising: a compressor; an evaporator; the conveying pipeline is used for conveying the refrigerant flowing out of the compressor to the evaporator so as to heat the evaporator when the evaporator is defrosted; the heating device is thermally connected with the conveying pipeline; and a processor and a memory, the memory having stored therein a machine executable program, the machine executable program when executed by the processor being for implementing a control method according to any of the above.
The refrigerating and freezing device and the control method thereof can utilize the conveying pipeline to convey the refrigerant flowing out of the compressor to the evaporator to heat the evaporator by improving the defrosting mode of the evaporator, and the refrigerating and freezing device can also utilize the heating device to preheat the refrigerant conveyed to the evaporator through the conveying pipeline by starting the heating device under the condition of determining the starting of the evaporator for defrosting because the conveying pipeline is thermally connected with the heating device, thereby reducing or avoiding excessive heat loss of the refrigerant when the refrigerant flows through the conveying pipeline, and further leading the evaporator to quickly and thoroughly defrost.
Further, according to the refrigeration and freezing device and the control method thereof, the step of starting the heating device can be judged whether to be executed or not by utilizing the environmental temperature of the working environment where the conveying pipeline is located, and the heating device is started only when the environmental temperature is lower than the preset environmental temperature threshold value, so that the refrigeration and freezing device can adjust the defrosting strategy of the evaporator according to the actual working condition, and the energy conservation is realized while the defrosting mode of the evaporator is optimized.
Furthermore, according to the refrigeration and freezing device and the control method thereof, the refrigeration and freezing device can be adjusted and controlled according to the defrosting process, and after the heating device is started, the operation parameters of the heating device can be adjusted according to the temperature change rate of the evaporator, so that the fineness of the control process can be improved, and the defrosting effect of the evaporator can be ensured.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a schematic block diagram of a refrigeration freezer apparatus according to one embodiment of the present invention;
fig. 2 is a schematic structural view of a refrigerating and freezing apparatus according to an embodiment of the present invention;
fig. 3 is a schematic block diagram of a refrigeration system of a refrigeration freezer in accordance with one embodiment of the present invention;
fig. 4 is a schematic diagram of a method of controlling a refrigeration chiller according to one embodiment of the present invention;
fig. 5 is a control flow diagram of a refrigeration freezer in accordance with one embodiment of the invention.
Detailed Description
Fig. 1 is a schematic block diagram of a refrigeration freezer 10 according to one embodiment of the invention. The refrigeration chiller 10 may generally include a compressor 210, an evaporator 230, a transfer line 220, a heating device 240, a processor 310, and a storage 320.
Wherein the compressor 210, the evaporator 230, the transfer line 220 and the heating device 240 form part of a refrigeration system of the refrigerated freezing apparatus 10. The refrigeration system may be a compression refrigeration system and form a refrigeration circuit for circulating a refrigerant.
Fig. 2 is a schematic structural view of the refrigerating and freezing apparatus 10 according to an embodiment of the present invention. Fig. 2 illustrates the structure of the refrigerating and freezing device 10 by way of example only of a refrigerator, but should not be construed as limiting the type of refrigerating and freezing device 10.
The refrigeration and freezing apparatus 10 of the present embodiment may further include a cabinet 100 defining a storage compartment 110 therein. The compressor 210, the evaporator 230, the delivery pipe 220, the heating device 240, the processor 310, and the storage 320 may be separately provided in the cabinet 100. The evaporator 230 is disposed corresponding to the storage compartment 110, and is configured to provide cold energy to the storage compartment 110. For example, in some embodiments, the evaporator 230 may be disposed at the rear side of the storage compartment 110 and deliver a heat exchange air flow to the storage compartment 110 through the air supply duct. The airflow passing through the evaporator 230 forms the above-described heat-exchanged airflow by exchanging heat with the evaporator 230.
The number of storage compartments 110 and the number of evaporators 230 may be plural. Each storage compartment 110 may be provided with one evaporator 230. The evaporator 230 of the above and following embodiments may refer to any one of a plurality of evaporators 230. In some alternative embodiments, the number of storage compartments 110 and the number of evaporators 230 may be one each.
Fig. 3 is a schematic configuration diagram of a refrigeration system of the refrigerating and freezing apparatus 10 according to an embodiment of the present invention. The present embodiment exemplifies the structure of the refrigeration system with one evaporator 230, and those skilled in the art should be fully capable of expanding the structure of the refrigeration system with a plurality of evaporators 230 based on the understanding of the present embodiment, and therefore, the structure is not shown.
The refrigeration system may further include a condenser 250 and a switching valve 260. The condenser 250 is disposed between the discharge port of the compressor 210 and the evaporator 230. The refrigerant flowing out of the compressor 210 condenses heat in the condenser 250, and then flows into the evaporator 230 to evaporate and absorb heat, thereby cooling the evaporator 230.
The delivery pipe 220 is disposed between the discharge port of the compressor 210 and the evaporator 230, and plays a role of delivering the refrigerant. The delivery pipe 220 is used to deliver the refrigerant flowing out of the compressor 210 to the evaporator 230 when the evaporator 230 is defrosted, thereby heating the evaporator 230. That is, when the evaporator 230 is defrosted, the refrigerant flowing out of the compressor 210 is sequentially transferred to the pipe 220 and the evaporator 230. As the refrigerant flows through the delivery line 220, the refrigerant flowing out of the compressor 210 does not flow through the condenser 250 and is directly guided into the evaporator 230, thereby condensing heat in the evaporator 230 and functioning to heat the evaporator 230.
The switching valve 260 is connected to the discharge port of the compressor 210, i.e., the inlet of the switching valve 260 communicates with the discharge port of the compressor 210. The switching valve 260 of the present embodiment is used for adjusting a flow path of the refrigerant flowing therethrough, so that the refrigerant flowing out of the compressor 210 selectively flows through the condenser 250 or the delivery pipe 220. The switching valve 260 has a valve port communicating with the delivery pipe 220 and a valve port communicating with the condenser 250, and the switching valve 260 adjusts the flow path of the refrigerant flowing therethrough by controllably opening and closing the valve port communicating with the delivery pipe 220 and the valve port communicating with the condenser 250. The delivery line 220 and the condenser 250 may be disposed substantially in parallel.
For example, when the evaporator 230 starts cooling, the switching valve 260 opens the valve port communicating with the condenser 250 and closes the valve port communicating with the delivery pipe 220. When the evaporator 230 starts defrosting, the switching valve 260 opens the valve port of the communication delivery pipe 220 and closes the valve port of the communication condenser 250.
The heating device 240 may be an electric heating device 240 for generating heat when energized, thereby performing a heating function. The transfer line 220 is thermally connected to a heating device 240. For example, the heating device 240 may be a heating wire or a heating sheet. The heating device 240 may be wrapped around the delivery pipe 220 or placed against the delivery pipe 220 to achieve thermal connection.
The refrigeration system of the present embodiment may further include a throttling device 280 and a check valve 270. The throttling device 280 is disposed between an outlet of the condenser 250 and an inlet of the evaporator 230, and is used for throttling the refrigerant flowing out of the condenser 250 and flowing to the evaporator 230.
The check valve 270 is disposed between an outlet of the throttling device 280 and an outlet of the delivery pipe 220, and is configured to allow the refrigerant from the throttling device 280 to pass through in a single direction. Since the outlet of the delivery pipe 220 is also communicated with the inlet of the evaporator 230, the one-way valve 270 is disposed between the outlet of the throttling device 280 and the outlet of the delivery pipe 220, so as to prevent the refrigerant flowing through the delivery pipe 220 from flowing back to enter the throttling device 280 and the condenser 250, thereby improving the reliability of the operation process of the refrigeration system.
The processor 310 and the memory 320 may form a control device of the refrigeration and freezing apparatus 10, and are disposed in the cabinet 100. The control device may be a main control board. The memory 320 stores a machine-executable program 321, and the machine-executable program 321 is executed by the processor 310 to implement the control method of the refrigeration and freezing apparatus 10 according to any one of the following embodiments. The processor 310 may be a Central Processing Unit (CPU), or a digital processing unit (DSP), etc. The memory 320 is used to store programs executed by the processor 310. The memory 320 may be any medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited thereto. The memory 320 may also be a combination of various memories 320. Since the machine executable 321 is executed by the processor 310 to implement the processes of the method embodiments described below and achieve the same technical effects, the descriptions thereof are omitted here for avoiding redundancy.
Fig. 4 is a schematic diagram of a control method of the refrigeration freezer 10 according to one embodiment of the invention. The control method may generally include:
in step S402, it is determined that the evaporator 230 starts defrosting. For example, when a defrosting start signal for the evaporator 230 of the refrigeration freezer 10 is acquired, it may be determined that the evaporator 230 starts defrosting.
In step S404, the heating device 240 is activated to preheat the refrigerant transmitted to the evaporator 230 through the transmission line 220.
By using the method, the refrigerant flowing out of the compressor 210 can be conveyed to the evaporator 230 by the conveying pipeline 220 of the refrigeration and freezing device 10 by improving the defrosting mode of the evaporator 230 to heat the evaporator 230, and because the conveying pipeline 220 is thermally connected with the heating device 240, under the condition that the evaporator 230 is determined to be started to defrost, the heating device 240 is started, the refrigeration and freezing device 10 can also utilize the heating device 240 to preheat the refrigerant conveyed to the evaporator 230 by the conveying pipeline 220, so that excessive heat loss of the refrigerant when the refrigerant flows through the conveying pipeline 220 can be reduced or avoided, meanwhile, the heat carried by the refrigerant can be improved, and the evaporator 230 can be defrosted rapidly and thoroughly.
Because the refrigerant can generate a large amount of heat when condensing heat in the evaporator 230, the refrigerant can heat the evaporator 230 from inside to outside, thereby being beneficial to improving the defrosting rate of the evaporator 230, shortening the defrosting period, preventing residual ice from being left on the evaporator 230, and reducing or avoiding excessive adverse effects on the temperature of the storage compartment 110 caused by the defrosting process of the evaporator 230.
It is considered that the amount of heat carried by the refrigerant delivered to the evaporator 230 is low immediately after the defrosting is started, resulting in a low defrosting rate of the evaporator 230 immediately after the defrosting is started. In the embodiment, the heating device 240 is thermally connected to the conveying pipeline 220, and the heating device 240 is used to preheat the refrigerant flowing to the evaporator 230, so that the heat carried by the refrigerant conveyed to the evaporator 230 can be properly increased, the defrosting rate of the evaporator 230 immediately after defrosting is started is increased, and the defrosting period of the whole defrosting process is shortened.
After determining that the evaporator 230 starts defrosting and before starting the heating device 240, the control method may further include: the control switch valve 260 opens a valve port communicated with the delivery pipe 220 and closes a valve port communicated with the condenser 250, and starts the compressor 210 to deliver the refrigerant flowing out of the compressor 210 to the evaporator 230 by using the delivery pipe 220. After the compressor 210 is started, the refrigerant flows through the refrigeration circuit by the compressor 210. The refrigerant flowing out of the discharge port of the compressor 210 is in a high pressure state, and when the refrigerant in the high pressure state is directly introduced into the evaporator 230, the evaporator 230 is converted into the condenser 250, and the refrigerant condenses heat in the evaporator 230.
In some alternative embodiments, the step of activating the compressor 210 and the step of activating the heating device 240 may be performed simultaneously, which is advantageous to simplify the control process.
In some optional embodiments, after activating the heating device 240, the control method may further include: the temperature of the conveying pipeline 220 is detected, whether the closing condition of the heating device 240 is met is judged according to the temperature of the conveying pipeline 220, and if yes, the heating device 240 is closed.
The step of determining whether the off condition of the heating device 240 is satisfied according to the temperature of the delivery pipe 220 includes: and judging whether the temperature of the conveying pipeline 220 reaches a preset pipeline temperature threshold value, and if so, determining that the temperature of the conveying pipeline 220 meets the closing condition of the heating device 240.
That is, the present embodiment is designed for the shutdown logic of the heating device 240, that is: after the heating device 240 is started, if the temperature of the delivery pipe 220 reaches a preset pipe temperature threshold, the heating device 240 is turned off.
After the defrosting is started, the temperature of the refrigerant flowing out of the compressor 210 may increase as the defrosting time is prolonged. Since the heating power of the heating device 240 is limited, when the temperature of the refrigerant flowing out of the compressor 210 is high, the heating effect of the heating device 240 is no longer significant. That is, when the temperature of the refrigerant flowing out of the compressor 210 is high, the defrosting rate of the evaporator 230 can be ensured without preheating the refrigerant by the heating device 240. By using the above method, unnecessary waste of electric energy by the heating apparatus 240 can be reduced or avoided by designing the shutdown logic of the heating apparatus 240.
The refrigeration and freezing apparatus 10 may further include a line temperature sensor disposed on the conveying line 220, for example, may be disposed on an outer wall of the conveying line 220, for detecting a temperature of the conveying line 220. The pipeline temperature sensor is arranged on the outer wall of the conveying pipeline 220, so that the installation difficulty of the pipeline temperature sensor can be reduced, and the manufacturing cost is reduced. In some alternative embodiments, the line temperature sensor may also be disposed on the inner wall of the delivery line 220, which may improve the accuracy of the temperature detection.
After the compressor 210 is started up at the preset operation frequency, the threshold value of the line temperature may be determined according to a correspondence between a detection value of the line temperature sensor and a defrosting rate of the evaporator 230 during a defrosting process. Throughout the defrosting process, the inventor recognizes that the defrosting rate of the evaporator 230 is characterized by rising and then stabilizing as the defrosting time is prolonged. The line temperature threshold may be a critical temperature value at which the rate of defrosting of evaporator 230 transitions from increasing to a trending temperature. For example, in some alternative embodiments, the threshold temperature of the pipeline may be any value between 40 ℃ and 50 ℃, for example, 45 ℃. In some embodiments, the defrosting rate of the evaporator 230 may be determined based on the rate of change of the temperature of the evaporator 230 during defrosting.
In some optional embodiments, before activating the heating device 240, for example, after performing step S402 and before performing step S404, the control method may further include: detecting the environmental temperature of the working environment of the conveying pipeline 220, determining whether the start condition of the heating device 240 is satisfied according to the environmental temperature, and if so, executing the step of starting the heating device 240. That is, the present embodiment is designed specifically for the power-on logic of the heating device 240. In some embodiments, the delivery line 220 is embedded within the foam layer. The working environment of the delivery pipe 220 refers to the temperature of the foam layer in contact with the delivery pipe 220.
The step of determining whether the start condition of the heating device 240 is satisfied according to the ambient temperature includes: whether the ambient temperature is lower than a preset ambient temperature threshold is judged, and if so, it is determined that the ambient temperature meets the starting condition of the heating device 240. That is, the heater 240 is activated only when the ambient temperature is low, and the evaporator 230 is heated only by the refrigerant flowing out of the compressor 210 without activating the heater 240 and preheating the refrigerant if the ambient temperature is high and the activation condition of the heater 240 is not satisfied.
When the ambient temperature is higher than or equal to the preset ambient temperature threshold, it indicates that the temperature difference between the refrigerant and the working environment is small, and excessive heat will not be dissipated when the refrigerant flows through the conveying pipeline 220, and at this time, the defrosting rate of the evaporator 230 can be ensured without starting the heating device 240 to preheat the refrigerant.
The ambient temperature threshold may be determined based on a correspondence between different ambient temperatures and a defrosting rate of the evaporator 230. The defrosting rate of the evaporator 230 may refer to a defrosting rate within a set time period (e.g., within 10-30 min) after the defrosting is started. The inventors have realized that as the ambient temperature decreases, the defrosting rate of the evaporator 230 decreases accordingly, and the ambient temperature corresponding to the maximum value of the change rate of the defrosting rate of the evaporator 230 may be selected as the ambient temperature threshold.
With the above method, since whether to execute the step of starting the heating device 240 can be determined by using the ambient temperature of the working environment where the conveying pipeline 220 is located, and the heating device 240 is started only when the ambient temperature is lower than the preset ambient temperature threshold, the refrigeration and freezing device 10 of the embodiment can adjust the defrosting strategy of the evaporator 230 according to the actual working condition, and realize energy saving while optimizing the defrosting mode of the evaporator 230.
In some alternative embodiments, before the heating device 240 is activated, the switching valve 260 described below is controlled to open the valve port communicating with the delivery pipe 220 and close the valve port communicating with the condenser 250, and the compressor 210 is activated to deliver the refrigerant flowing out of the compressor 210 to the evaporator 230 by using the delivery pipe 220. After that, the control method may further include: detecting the temperature of the conveying pipeline 220, judging whether the starting condition of the heating device 240 is met according to the temperature of the conveying pipeline 220, and if so, executing the step of starting the heating device 240. That is, the present embodiment is directed to the switching on logic of the heating device 240. For example, when the temperature of the delivery pipe 220 is lower than the preset startup temperature, which indicates that the temperature of the refrigerant flowing through the delivery pipe 220 is low, the startup condition of the heating device 240 is satisfied, and the step of starting the heating device 240 may be executed, so as to increase the appropriate temperature of the refrigerant. The preset starting temperature can be any value within the range of 30-50 ℃, such as 45 ℃.
In some alternative embodiments, the step of activating the heating device 240 may include: the environmental temperature of the working environment of the conveying pipeline 220 is detected, the operating parameters of the heating device 240 are determined according to the environmental temperature, and the heating device 240 is controlled to be started according to the operating parameters.
Wherein the operating parameter of the heating device 240 includes heating power. That is, the heating power of the heating device 240 may be determined according to the ambient temperature. For example, when the ambient temperature is low, the heating device 240 can be started to operate according to a high heating power because the temperature difference between the refrigerant and the working environment is large and the heat loss is large, and when the ambient temperature is high, the heating device 240 can be started to operate according to a low heating power because the temperature difference between the refrigerant and the working environment is small and the heat loss is small.
The step of determining the heating power of the heating device 240 according to the ambient temperature includes: acquiring a plurality of preset temperature ranges, wherein each temperature range is correspondingly provided with a preset heating power, and determining the heating power of the heating device 240 according to the temperature range to which the ambient temperature belongs. That is, the heating power corresponding to the temperature range to which the ambient temperature belongs is determined as the heating power of the heating device 240. The temperature values in the respective temperature ranges are increased step by step, and accordingly, the heating powers corresponding to the respective temperature ranges are decreased step by step, that is, the higher the ambient temperature is, the lower the heating power is.
By presetting a plurality of temperature ranges and presetting the corresponding relationship between each temperature range and the preset heating power, the heating power corresponding to the temperature range to which the ambient temperature belongs can be quickly determined, which is beneficial to simplifying the determination process of the operating parameters of the heating device 240.
In some optional embodiments, after activating the heating device 240, the method may further include: the temperature of the evaporator 230 is detected at set intervals, the rate of change of the temperature of the evaporator 230 is determined according to the temperature of the evaporator 230, and the operating parameters of the heating device 240 are adjusted according to the rate of change of the temperature of the evaporator 230. That is, the present embodiment is specially designed for the control logic of the defrosting process of the evaporator 230.
After the evaporator 230 starts defrosting, the temperature change rate of the evaporator 230 can reflect the defrosting rate of the actual defrosting process. The step of adjusting the operating parameters of the heating device 240 according to the rate of change of the temperature of the evaporator 230 may include: and judging whether the temperature change rate of the evaporator 230 is lower than a preset rate threshold, if so, increasing the heating power of the heating device 240, so as to increase the heating effect of the heating device 240 until the heating power of the heating device 240 reaches a maximum value. The rate threshold may be set by a user or engineer according to a desired rate of defrosting of evaporator 230. For example, in some embodiments, the rate threshold may be 0.1 to 0.5 ℃/min.
Because the refrigerating and freezing device 10 can be adjusted and controlled according to the defrosting process, after the heating device 240 is started, the operating parameters of the heating device 240 can be adjusted according to the temperature change rate of the evaporator 230, which is beneficial to improving the fineness of the control process, thereby ensuring the defrosting effect of the evaporator 230.
In some optional embodiments, after determining the rate of temperature change of the evaporator 230, the control logic for the defrosting process of the evaporator 230 may further include: the operating parameters of the compressor 210 are adjusted according to the rate of change of the temperature of the evaporator 230. The step of adjusting the operating parameters of the compressor 210 according to the rate of temperature change of the evaporator 230 may include: whether the temperature change rate of the evaporator 230 is lower than a preset rate threshold is judged, and if so, the operating frequency of the compressor 210 can be increased, so that the outlet pressure of the refrigerant flowing out of the compressor 210 is increased, which is beneficial to improving the heating effect of the refrigerant on the evaporator 230, and further increasing the defrosting rate of the evaporator 230.
Fig. 5 is a control flow diagram of the refrigeration freezer 10 according to one embodiment of the invention. The control flow may generally include:
in step S502, it is determined that the evaporator 230 starts defrosting.
In step S504, the switching valve 260 is controlled to open the valve port communicated with the delivery pipe 220 and close the valve port communicated with the condenser 250, and the compressor 210 is started to deliver the refrigerant flowing out of the compressor 210 to the evaporator 230 by using the delivery pipe 220.
In step S506, the ambient temperature of the working environment of the delivery pipe 220 is detected.
Step S508, determining whether the ambient temperature is lower than a preset ambient temperature threshold, if so, performing step S510, and if not, performing step S532.
In step S510, it is determined that the ambient temperature satisfies the activation condition of the heating device 240.
Step S512, a plurality of preset temperature ranges are obtained, and each temperature range is correspondingly provided with preset heating power.
In step S514, the heating power of the heating device 240 is determined according to the temperature range to which the ambient temperature belongs.
In step S516, the heating device 240 is controlled to be activated according to the heating power.
In step S518, the temperature of the delivery pipe 220 is detected.
In step S520, it is determined whether the temperature of the delivery pipe 220 reaches a preset pipe temperature threshold, if yes, step S528 is executed, and if no, step S522 is executed.
In step S522, the temperature of the evaporator 230 is detected at set time intervals.
In step S524, the temperature change rate of the evaporator 230 is determined according to the temperature of the evaporator 230.
In step S526, the operating parameters of the heating device 240 are adjusted according to the rate of change of the temperature of the evaporator 230.
In step S528, it is determined that the temperature of the delivery pipe 220 satisfies the shut-off condition of the heating device 240.
In step S530, the heating device 240 is turned off.
In step S532, when the evaporator 230 finishes defrosting, the compressor 210 is turned off. In some embodiments, the determination condition for the evaporator 230 to end defrosting may be: the temperature of the evaporator 230 reaches a certain value (e.g., 2 ℃) within a range of 0 to 5 ℃, or the defrosting time of the evaporator 230 reaches a preset defrosting period (a certain value, e.g., 120min, within a range of 90 to 150 min). When the evaporator 230 satisfies the condition for finishing defrosting, the heating device 240 is turned off and the compressor 210 is stopped.
In still other alternative embodiments, the shutdown condition of the heating device 240 may be changed to: the operation time of the heating device 240 reaches a certain specific value within the range of 60-120 min, for example, 90 min. If the evaporator 230 does not satisfy the condition for finishing defrosting and the heating device 240 reaches the shutdown condition, the heating device 240 is turned off, the evaporator 230 is heated only by the refrigerant flowing out of the compressor 210, and the compressor 210 is turned off when the evaporator 230 satisfies the condition for finishing defrosting.
In the refrigeration and freezing apparatus 10 and the control method thereof of the embodiment, by improving the defrosting mode of the evaporator 230, the refrigeration and freezing apparatus 10 can utilize the conveying pipeline 220 to convey the refrigerant flowing out of the compressor 210 to the evaporator 230 to heat the evaporator 230, and because the conveying pipeline 220 is thermally connected with the heating device 240, under the condition that the evaporator 230 is determined to start defrosting, the refrigeration and freezing apparatus 10 can also utilize the heating device 240 to preheat the refrigerant conveyed to the evaporator 230 through the conveying pipeline 220, which can reduce or avoid excessive heat loss of the refrigerant when flowing through the conveying pipeline 220, so that the evaporator 230 can be defrosted rapidly and thoroughly. Through utilizing heating device 240 to optimize the defrosting mode of evaporimeter 230, can solve to a certain extent and change the cycle length, change the incomplete problem of frost, possess application prospect.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (10)
1. A control method of a cold storage and refrigeration apparatus having a compressor, an evaporator, a heating device, and a delivery line for delivering a refrigerant flowing out of the compressor to the evaporator to heat the evaporator when the evaporator is defrosted, the heating device being thermally connected to the delivery line, and the control method comprising:
determining that the evaporator is started to defrost;
and starting the heating device to preheat the refrigerant conveyed to the evaporator through the conveying pipeline.
2. The control method according to claim 1, further comprising, after activating the heating device:
detecting the temperature of the conveying pipeline;
judging whether the closing condition of the heating device is met or not according to the temperature of the conveying pipeline;
if yes, the heating device is closed.
3. The control method according to claim 2, wherein,
the step of judging whether the closing condition of the heating device is met according to the temperature of the conveying pipeline comprises the following steps:
judging whether the temperature of the conveying pipeline reaches a preset pipeline temperature threshold value or not;
and if so, determining that the temperature of the conveying pipeline meets the closing condition of the heating device.
4. The control method according to claim 1, wherein before activating the heating device, further comprising:
detecting the environmental temperature of the working environment of the conveying pipeline;
judging whether the starting condition of the heating device is met or not according to the environment temperature;
if yes, executing the step of starting the heating device.
5. The control method according to claim 4,
the step of judging whether the starting condition of the heating device is met according to the environment temperature comprises the following steps:
judging whether the ambient temperature is lower than a preset ambient temperature threshold value or not;
and if so, determining that the environmental temperature meets the starting condition of the heating device.
6. The control method according to claim 1,
the refrigerating and freezing device also comprises a switching valve and a condenser, wherein the switching valve is connected to the exhaust port of the compressor and is provided with a valve port communicated with the conveying pipeline and a valve port communicated with the condenser; and after determining that the evaporator is activated to defrost and before activating the heating device, the control method further comprises:
and controlling the switching valve to open a valve port communicated with the conveying pipeline and close a valve port communicated with the condenser, and starting the compressor so as to convey the refrigerant flowing out of the compressor to the evaporator by utilizing the conveying pipeline.
7. The control method according to claim 1,
the step of activating the heating means comprises:
detecting the environmental temperature of the working environment of the heating device;
determining operating parameters of the heating device according to the ambient temperature;
and controlling the heating device to start according to the operating parameters.
8. The control method according to claim 7,
the operating parameters of the heating device comprise heating power; and is
The step of determining the heating power of the heating device from the ambient temperature comprises:
acquiring a plurality of preset temperature ranges, wherein each temperature range is correspondingly provided with preset heating power;
and determining the heating power of the heating device according to the temperature range to which the environment temperature belongs.
9. The control method according to claim 7, further comprising, after activating the heating device:
continuously detecting the temperature of the evaporator within a set time period;
determining the temperature change rate of the evaporator according to the temperature of the evaporator;
and adjusting the operating parameters of the heating device according to the temperature change rate of the evaporator.
10. A refrigeration chiller comprising:
a compressor;
an evaporator;
the conveying pipeline is used for conveying the refrigerant flowing out of the compressor to the evaporator so as to heat the evaporator when the evaporator is defrosted;
a heating device thermally connected to the delivery line; and
a processor and a memory, the memory having stored therein a machine executable program, which when executed by the processor, is for implementing a control method according to any one of claims 1 to 9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111011914.4A CN113720088A (en) | 2021-08-31 | 2021-08-31 | Refrigerating and freezing device and control method thereof |
| PCT/CN2022/088796 WO2023029521A1 (en) | 2021-08-31 | 2022-04-24 | Refrigerating and freezing apparatus and control method therefor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111011914.4A CN113720088A (en) | 2021-08-31 | 2021-08-31 | Refrigerating and freezing device and control method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023029521A1 (en) * | 2021-08-31 | 2023-03-09 | 青岛海尔电冰箱有限公司 | Refrigerating and freezing apparatus and control method therefor |
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| WO2023029521A1 (en) | 2023-03-09 |
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